Solarc M50E021 50W - Ushio Metal Halide Replacement Lamp

Solarc M50E021 50W Ushio Metal Halide Light Bulb 6000K Color Temperature, 2500 Hours

Ushio part number M50E021 is a 50 watt (50W) Solarc metal halide lamp with elliptical reflector.
The lamp was previously manufactured by Welch-Allyn, and now are made by Ushio America (replacement part 50 6000 2500)
M50E021 has an average life of 2500 hours. The correlated color temperature is 6000K
The luminous flux through a 10mm aperture is 2500 lumens, while through a 6 mm aperture it provides 2000 lumens.
This lamp requires an Ushio B50R004R regulated ballast. The ballast requires an input voltage of 12.0-15.0VDC and a steady state current of 5.6 amps at 12 VDC.
The warm-up time to 90% output is 40 seconds and the restart time is 60 seconds. The numerical aperture (NA) is 0.69 and the spot size at the focal plane F2 is 6 mm @ 50% Intensity. The F2 focal distance from the rim is 23.8mm.